多次释放胡瓜新小绥螨对橘园节肢动物群落多样性的影响

为了探明长期多次释放胡瓜新小绥螨(Neoseiulus(Amblyseius)cucumeris)是否会对橘园节肢动物群落的生物多样性产生影响,我们在福州马尾和晋安试验区的2个橘园分别设置生防园、自然园和化防园,连续两年每月两次在各处理橘园的树冠和地面杂草中采集并记录节肢动物的种类和数量,结果表明两个试验区的物种丰富度(S)均以生防园最高,且都显著高于相应的化防园和自然园;马尾试验区三种处理的多样性指数(H’)和均匀度指数(E)的大小依次为生防园>自然园>化防园,晋安试验区则为自然园>生防园>化防园,表明释放胡瓜新小绥螨防治柑橘害螨,减少农药的使用,能恢复或增加橘园节肢动物群落的生物多样性。此外,释放胡瓜新小绥螨未对橘园原有的捕食螨类群产生影响。

The effect of repeated release of the predatory mite Neoseiulus (Amblyseius) cucumeris on arthropod communities in citrus ecosystems

In order to study the effect of repeated release of Neoseiulus(Amblyseius) cucumeris on the spe-cies composition and diversity of arthropod community in citrus ecosystems,we established bio-control or-chards,natural orchards and chemical control orchards in the Mawei and Jin’an experimental field of Fuzhou,China.Our results indicated that the species richness of bio-control orchards was higher than that of natural or chemical control orchards at both sites.Diversity and evenness indices were higher in bio-control orchards than those of other orchards in the Mawei site,and those of chemical control orchards were the lowest.Among the variously managed orchards in Jin’an,evenness and diversity indices were highest in the natural orchards and lowest in chemical orchards.Our study suggests that citrus ecosystem arthropod diver-sity can be enhanced by releasing N.cucumeris to fight against the citrus pest mites while reducing the spraying of pesticide.